WO2005057636A1 - ステージ装置、露光装置、及び露光方法 - Google Patents
ステージ装置、露光装置、及び露光方法 Download PDFInfo
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- WO2005057636A1 WO2005057636A1 PCT/JP2004/018702 JP2004018702W WO2005057636A1 WO 2005057636 A1 WO2005057636 A1 WO 2005057636A1 JP 2004018702 W JP2004018702 W JP 2004018702W WO 2005057636 A1 WO2005057636 A1 WO 2005057636A1
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- WIPO (PCT)
- Prior art keywords
- substrate
- liquid
- stage
- stage device
- holder
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70341—Details of immersion lithography aspects, e.g. exposure media or control of immersion liquid supply
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70691—Handling of masks or workpieces
- G03F7/70716—Stages
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
Definitions
- the present invention relates to a stage apparatus having a holder for holding a substrate and a stage for supporting and moving the holder, an exposure apparatus having the stage apparatus, and an exposure method, and particularly to a projection optical system, a liquid, More particularly, the present invention relates to a stage device, an exposure apparatus, and an exposure method which are suitable for use when exposing a pattern image to a substrate via a substrate. Also, the present application
- Semiconductor devices and liquid crystal display devices are manufactured by a so-called photolithography technique in which a pattern formed on a mask is transferred onto a photosensitive substrate.
- An exposure apparatus used in the photolithography process has a mask stage for supporting a mask and a substrate stage for supporting a substrate.
- the mask stage and the substrate stage are sequentially moved, and a projection optical system is used to project the pattern of the mask. Transfer to the substrate via
- further improvement in the resolution of the projection optical system has been desired in order to cope with higher integration of device patterns.
- the resolution of the projection optical system increases as the exposure wavelength used decreases and as the numerical aperture of the projection optical system increases. For this reason, the exposure wavelength used in the exposure apparatus is becoming shorter year by year, and the numerical aperture of the projection optical system is also increasing.
- the mainstream exposure wavelength is 248 nm for KrF excimer laser, and 193 nm for ArF excimer laser with shorter wavelength is being put into practical use.
- the depth of focus (DOF) is as important as the resolution.
- the resolution and the depth of focus ⁇ are respectively represented by the following equations.
- e is the exposure wavelength
- NA is the numerical aperture of the projection optical system
- kl and k2 are the process coefficients. From equations (1) and (2), to increase the resolution R, shorten the exposure wavelength and increase the numerical aperture NA. It can be seen that as the depth increases, the depth of focus ⁇ decreases.
- a liquid immersion method disclosed in Patent Document 1 below has been proposed.
- this immersion method the space between the lower surface of the projection optical system and the substrate surface is filled with a liquid such as water or an organic solvent to form an immersion area.
- the resolution is improved by utilizing the fact that n (n is the refractive index of the liquid is usually about 1.2.1.6), and the depth of focus is increased by about ⁇ times.
- Patent Document 1 WO 99/49504 pamphlet
- a liquid is locally filled between an end surface on the image plane side of a projection optical system and a substrate (wafer).
- the projection area 100 of the projection optical system is applied to the peripheral area (edge area) ⁇ of the substrate ⁇ to expose the edge area ⁇ of the substrate ⁇ .
- the liquid flows out of the substrate and the immersion area is not well formed, which causes a problem that the projected pattern image is deteriorated.
- the escaping liquid causes inconveniences such as causing cracks in mechanical parts and the like around the substrate stage supporting the substrate and causing leakage of the stage drive system.
- the liquid is likely to flow around through the [0006]
- the present invention has been made in view of the above points, and prevents liquid from entering between a substrate and a holder, and can satisfactorily perform liquid exposure even when an edge region of the substrate is exposed. It is an object of the present invention to provide a stage device, an exposure apparatus, and an exposure method that can perform exposure in a state where an immersion area is formed.
- the present invention employs the following configuration corresponding to Figs. 1 to 9 showing an embodiment of the present invention.
- the stage device of the present invention is a stage device including a holder having a substrate holding surface for holding a substrate, and a stage that supports and moves the holder, and is arranged near the holder, and at least a part of the stage device is provided.
- a lyophilic part having lyophilicity is provided, and a recovery device for recovering liquid using the lyophilic part is provided.
- the lyophilic portion has an affinity for the liquid, the liquid that has entered the vicinity of the holder can be collected by being guided away from the substrate holding surface. Therefore, it is possible to prevent the liquid from penetrating between the substrate holding surface and the back surface of the substrate, and to expose the edge region of the substrate with the liquid immersion region formed well.
- an exposure apparatus of the present invention includes the stage device according to any one of claims 1 to 12.
- the exposure method of the present invention is an exposure method for transferring a pattern of a mask onto a substrate on a holder via the projection optical system while filling a liquid between the projection optical system and the substrate. Exposure is performed while preventing intrusion of liquid into the back surface.
- the exposure apparatus and the exposure method of the present invention even when the liquid is filled between the projection optical system and the substrate to expose the edge region of the substrate, the liquid is transferred between the substrate holding surface and the back surface of the substrate. Can be prevented from entering. Therefore, it is possible to perform exposure while holding the substrate well.
- the liquid is prevented from flowing between the substrate and the holder, and the immersion exposure can be performed while the liquid is well held under the projection optical system.
- FIG. 1 is a schematic configuration diagram showing one embodiment of an exposure apparatus of the present invention.
- FIG. 2 is a schematic configuration diagram showing a liquid supply mechanism and a liquid recovery mechanism.
- FIG. 3 is a plan view of a substrate stage.
- FIG. 4 is a sectional view of a main part of the substrate stage according to the first embodiment.
- FIG. 5 is a sectional view of a main part of a substrate stage according to a second embodiment.
- FIG. 6 is an enlarged plan view of a substrate stage according to a second embodiment.
- FIG. 7 is a sectional view of a main part of a substrate stage according to a third embodiment.
- FIG. 8 is a cross-sectional view of a main part of a substrate stage of another embodiment.
- FIG. 9 is a flowchart illustrating an example of a semiconductor device manufacturing process.
- FIG. 10 is a schematic diagram for explaining a problem of a conventional exposure method.
- EX exposure apparatus P substrate PB side surface (outer periphery) PH substrate holder (holder) PL projection optical system PST substrate stage (stage device) 1 Liquid 3 inner peripheral surface (lyophilic portion, collection device) 5 Inclined surface ( 8 Slit (recess) 33A, 34A Upper end surface (substrate holding surface) 39 space 52 Substrate table (stage) 52A Step (lyophilic portion, recovery device) 60 Suction device (recovery device) )
- FIG. 1 is a schematic configuration diagram showing an embodiment of the exposure apparatus of the present invention. (First Embodiment)
- an exposure apparatus EX includes a mask stage MST supporting a mask M, a substrate stage PST supporting a substrate P, and an illumination for illuminating a mask M supported by the mask stage MST with exposure light EL.
- the exposure apparatus EX of the present embodiment is an immersion exposure apparatus to which the immersion method is applied in order to substantially shorten the exposure wavelength to improve the resolution and to substantially increase the depth of focus.
- pure water is used as the liquid 1.
- the exposure apparatus EX uses at least a portion of the projection area AR1 of the projection optical system PL on the substrate P by the liquid 1 supplied from the liquid supply mechanism 10 while transferring the pattern image of the mask M onto the substrate P at least.
- a liquid immersion area AR2 is formed at the bottom.
- the exposure apparatus EX fills the liquid 1 between the optical element 2 at the tip of the projection optical system PL and the surface (exposure surface) PA (see FIG. 4) of the substrate P,
- the pattern image of the mask M is projected onto the substrate P via the liquid 1 between the PL and the substrate and the projection optical system PL, and the substrate P is exposed.
- a pattern formed on the mask M while synchronizing movement of the mask M and the substrate P in different directions (opposite directions) in the running direction as the exposure apparatus EX is used as the substrate.
- An example in which a scanning exposure apparatus that exposes P (a so-called scanning stepper) is used will be described.
- the direction that coincides with the optical axis AX of the projection optical system PL is the Z-axis direction
- the synchronous movement direction (scanning direction) between the mask M and the substrate P in a plane perpendicular to the Z-axis direction is the X-axis direction
- the direction perpendicular to the Z-axis direction and the Y-axis direction (non-scanning direction) is defined as the Y-axis direction.
- directions around the X axis, the Y axis, and the Z axis are directions of ⁇ , ⁇ , and ⁇ ⁇ ⁇ ⁇ , respectively.
- the “substrate” includes a semiconductor wafer coated with a photoresist as a photosensitive material
- the “mask” is a layer formed with a device pattern to be reduced and projected on the substrate.
- the illumination optical system IL illuminates the mask ⁇ supported by the mask stage MST with the exposure light EL.
- the illumination light system IL is used to make the illuminance of the exposure light source and the light flux emitted from the exposure light source uniform. It has a condenser lens that collects the exposure light EL from the canola integrator and opti-canole integrator, a relay lens system, and a variable field stop that sets the illumination area on the mask ⁇ ⁇ in slit form with the exposure light EL. ing.
- a predetermined illumination area on the mask ⁇ is illuminated by the illumination optical system IL with exposure light EL having a uniform illuminance distribution.
- the exposure light EL emitted from the illumination optical system IL is, for example, an ultraviolet emission line (g line, h Ultraviolet light (DUV light) such as X-ray, i-line) and KrF excimer laser light (wavelength 248 nm), and vacuum ultraviolet light such as Ar F excimer laser light (wavelength 193 nm) and F laser light (wavelength 157 nm)
- g line h Ultraviolet light (DUV light) such as X-ray, i-line) and KrF excimer laser light (wavelength 248 nm)
- vacuum ultraviolet light such as Ar F excimer laser light (wavelength 193 nm) and F laser light (wavelength 157 nm)
- VUV light VUV light
- ArF excimer laser light is used.
- the liquid 1 in the present embodiment is pure water, and can be transmitted even when the exposure light EL is ArF excimer laser light. Pure water is also capable of transmitting ultraviolet light (g-line, h-line, i-line) and far ultraviolet light (DUV light) such as KrF excimer laser light (wavelength: 248 nm).
- the mask stage MST supports the mask M, and is two-dimensionally movable in a plane perpendicular to the optical axis AX of the projection optical system PL, that is, in the XY plane, and is capable of minute rotation in the ⁇ Z direction. .
- the mask stage MST is driven by a mask stage driving device MST D such as a linear motor.
- the mask stage drive MSTD is controlled by the controller CONT.
- a moving mirror 50 is provided on the mask stage MST.
- a laser interferometer 51 is provided at a position facing the movable mirror 50. The position and rotation angle of the mask M in the two-dimensional direction on the mask stage MST are measured in real time by the laser interferometer 51, and the measurement results are output to the control device CONT.
- the control device CONT positions the mask M supported by the mask stage MST by driving the mask stage driving device MSTD based on the measurement results of the laser interferometer 51.
- the projection optical system PL is for projecting and exposing the pattern of the mask M to the substrate ⁇ at a predetermined projection magnification ⁇ , and includes a plurality of optical elements (lenses) 2 provided at the tip of the substrate ⁇ . These optical elements are supported by a lens barrel ⁇ .
- the projection optical system PL is a reduction system whose projection magnification is, for example, 1/4 or 1/5. Note that the projection optical system PL may be either a unity magnification system or an enlargement system.
- the optical element 2 at the tip of the projection optical system PL of the present embodiment is provided so as to be attachable / detachable (replaceable) to / from the lens barrel PK. Contact.
- the optical element 2 is formed of fluorite. Since fluorite has a high affinity for water, the liquid 1 can be brought into close contact with almost the entire liquid contact surface 2a of the optical element 2. That is, in the present embodiment, the liquid (water) 1 having a high affinity with the liquid contact surface 2a of the optical element 2 is supplied, so that the liquid contact surface 2a of the optical element 2 is supplied. With high adhesion between liquid and liquid 1 The optical path between the element 2 and the substrate P can be reliably filled with the liquid 1.
- the optical element 2 may be quartz having a high affinity (hydrophilicity) with water. Further, the liquid contact surface 2a of the optical element 2 may be subjected to a hydrophilic (lyophilic) treatment to further enhance the affinity with the liquid 1.
- the lens barrel PK since the lens barrel PK has the vicinity of the tip in contact with the liquid (water) 1, at least the vicinity of the tip is formed of a metal such as Ti (titanium) which is resistant to cracks.
- the substrate stage PST supports the substrate P, and includes a substrate table (stage) 52 for holding the substrate P via a substrate holder PH, an XY stage 53 for supporting the substrate table 52, and an XY stage. And a base 54 for supporting 53.
- the substrate stage PST is driven by a substrate stage driving device PSTD such as a free motor.
- the substrate stage drive PSTD is controlled by the controller CONT.
- the position of the substrate P in the XY direction (the position in a direction substantially parallel to the image plane of the projection optical system PL) is controlled. That is, the substrate table 52 functions as a Z stage that controls the focus position and the tilt angle of the substrate P to adjust the surface of the substrate P to the image plane of the projection optical system PL by the autofocus method and the auto-leveling method.
- the XY stage 53 positions the substrate P in the X-axis direction and the Y-axis direction. It goes without saying that the substrate table and the XY stage may be provided integrally.
- a movable mirror 55 is provided on the substrate stage PST (substrate table 52).
- a laser interferometer 56 is provided at a position facing the moving mirror 55. The position and the rotation angle of the substrate P on the substrate stage PST in the two-dimensional direction are measured in real time by the laser interferometer 56, and the measurement result is output to the control device CONT.
- the control device CONT drives the substrate stage driving device PSTD based on the measurement result of the laser interferometer 56 to position the substrate P supported by the substrate stage PST.
- a ring-shaped plate portion 30 surrounding the substrate P is provided on the substrate stage PST (substrate table 52).
- the plate portion 30 is fixed in a state of being fitted around the substrate table 52 on the outer periphery, and a concave portion 32 is formed inside the plate portion 30.
- the plate unit 30 and the substrate table 52 may be provided integrally.
- the rudder PH is located in the recess 32 (see FIG. 4).
- the plate portion 30 has a flat surface 31 having substantially the same height as the surface PA of the substrate P held by the substrate holder PH arranged in the concave portion 32. The details of the plate unit 30 and the substrate holder PH will be described later.
- the liquid supply mechanism 10 supplies a predetermined liquid 1 onto the substrate P, and includes a first liquid supply unit 11 and a second liquid supply unit 12 capable of supplying the liquid 1, and a first liquid supply unit
- a first supply member 13 having a supply port 13A connected to the section 11 via a supply pipe 11A having a flow path and supplying the liquid 1 sent from the first liquid supply section 11 onto the substrate P;
- a second supply member connected to the second liquid supply section via a supply pipe having a flow path, and having a supply port for supplying the liquid supplied from the second liquid supply section onto the substrate; It is equipped with.
- the first and second supply members 13 and 14 are arranged close to the surface of the substrate P, and are provided at different positions in the plane direction of the substrate P. Specifically, the first supply member 13 of the liquid supply mechanism 10 is provided on one side (one X side) in the scanning direction with respect to the projection area AR1, and the second supply member 14 is provided on the other side (+ X side). Let's do it.
- Each of the first and second liquid supply units 11, 12 includes a tank for accommodating the liquid 1, a pressurized pump, and the like, and supplies the supply pipes 11A, 12A and the supply members 13, 14 respectively.
- the liquid 1 is supplied onto the substrate P via
- the liquid supply operation of the first and second liquid supply units 11 and 12 is controlled by a controller CONT.
- the controller CONT controls the liquid per unit time on the substrate P by the first and second liquid supply units 11 and 12.
- the supply amount can be controlled independently of each other.
- each of the first and second liquid supply units 11 and 12 has a liquid temperature adjusting mechanism, and supplies the liquid 1 at a temperature substantially equal to the temperature in the chamber in which the device is housed (for example, 23 ° C). It is supplied on the substrate P.
- the liquid recovery mechanism 20 recovers the liquid 1 on the substrate P, and has first and second recovery members 23, 24 having recovery ports 23A, 24A arranged close to the surface of the substrate P. And first and second liquid recovery sections 21 and 22 connected to the first and second recovery members 23 and 24 via recovery pipes 21A and 22A having flow paths, respectively.
- the first and second liquid recovery units 21 and 22 are provided with, for example, a suction device such as a vacuum pump and a tank for storing the recovered liquid 1.
- the first and second recovery members collect the liquid 1 on the substrate P. Collect via 23, 24 and collection tubes 21A, 22A.
- the liquid recovery operation of the first and second liquid recovery units 21 and 22 is controlled by the controller CONT
- the control device CONT can control the amount of liquid recovered per unit time by the first and second liquid recovery units 21 and 22.
- FIG. 2 is a plan view showing a schematic configuration of the liquid supply mechanism 10 and the liquid recovery mechanism 20.
- the projection area AR1 of the projection optical system PL is set in a slit shape (rectangular shape) whose longitudinal direction is in the Y-axis direction (non-scanning direction).
- the area AR2 is formed on a part of the substrate P so as to include the projection area AR1.
- the first supply member 13 of the liquid supply mechanism 10 for forming the liquid immersion area AR2 of the projection area AR1 is provided on one side (1X side) in the scanning direction with respect to the projection area AR1, and the second supply member 14 is provided on the other side (+ X side).
- Each of the first and second supply members 13, 14 is formed in a substantially arc shape in plan view, and the size of the supply ports 13A, 14A in the Y-axis direction is at least the Y-axis direction of the projection area AR1. Is set to be larger than the size in.
- the supply ports 13A and 14A formed in a substantially arc shape in plan view are arranged so as to sandwich the projection area AR1 in the scanning direction (X-axis direction).
- the liquid supply mechanism 10 simultaneously supplies the liquid 1 on both sides of the projection area AR1 via the supply ports 13A and 14A of the first and second supply members 13 and 14.
- Each of the first and second recovery members 23 and 24 of the liquid recovery mechanism 20 has recovery ports 23 A and 24 A continuously formed in an arc shape so as to face the surface of the substrate P.
- the first and second collection members 23 and 24 arranged so as to face each other form a substantially annular collection port.
- the recovery ports 23A and 24A of the first and second recovery members 23 and 24 are arranged so as to surround the first and second supply members 13 and 14 of the liquid supply mechanism 10 and the projection area AR1. Further, a plurality of partition members 25 are provided inside the collection port continuously formed so as to surround the projection area AR1.
- the liquid 1 supplied onto the substrate P from the supply ports 13A and 14A of the first and second supply members 13 and 14 is supplied to the substrate P and the lower end surface of the tip (optical element 2) of the projection optical system PL. It is supplied so that it spreads wet between.
- the liquid 1 that has flowed out of the first and second supply members 13 and 14 with respect to the projection area AR1 is arranged outside the projection area AR1 by the first and second supply members 13 and 14. It is collected from the collection ports 23A and 24A of the first and second collection members 23 and 24.
- the projection area AR1 when the substrate P is subjected to scanning exposure, the projection area AR1
- the liquid supply amount per unit time supplied from before this is set larger than the liquid supply amount supplied on the opposite side.
- the controller CONT controls the liquid amount from one X side (ie, the supply port 13A) to the projection area AR1 on the + X side (ie, the supply port). 14A), while performing exposure processing while moving the substrate P in the 1X direction, the liquid volume from the + X side to the projection area AR1 is larger than the liquid volume from the 1X side. I do.
- the liquid recovery force per unit time before the projection area AR1 is set to be smaller than the liquid recovery amount on the opposite side.
- the recovery amount from the + X side (that is, the recovery port 24A) with respect to the projection area AR1 is larger than the -X side (that is, the recovery port 23A) force recovery amount. I do.
- FIG. 3 is a plan view of the substrate table 52 of the substrate stage PST as viewed from above.
- a movable mirror 55 is arranged at two mutually perpendicular edges of a substrate table 52 having a rectangular shape in a plan view. Near the intersection of the movable mirrors 55, 55, a reference mark FM used for aligning the mask M and the substrate P with respect to a predetermined position is provided.
- various sensors such as an illuminance sensor are also provided around the substrate P on the substrate stage PST.
- a concave portion 32 is formed at a substantially central portion of the substrate table 52 in a circular shape in a plan view, and a support portion 52a for supporting the substrate holder PH is protruded from the concave portion 32 (see FIG. 4). Then, as shown in FIG. 4, the substrate holder PH for holding the substrate P is supported by the support portion 52a and arranged in the recess 32 with a gap from the substrate table 52. Note that the gap between the substrate table 52 and the substrate holder PH is set (opened) to the atmospheric pressure. Further, a plate portion 30 having a flat surface 31 having substantially the same height as the surface of the substrate P is provided around the substrate P.
- the substrate holder PH has a substantially annular peripheral wall portion 33 that holds the back surface PC of the substrate P inside the outer periphery of the substrate P, and a plurality of holders that are arranged inside the peripheral wall portion 33 and hold the substrate P. And a supporting portion 34.
- the peripheral wall part 33 and the support part 34 are provided on a substantially disk-shaped base part 35 that constitutes a part of the substrate holder PH.
- Each of the support portions 34 has a trapezoidal shape in cross section, and the substrate P has its back surface PC connected to the upper end surface (substrate holding surface) 33A of the peripheral wall portion 33 It is held on the upper end surface (substrate holding surface) 34A of the support portion 34 of the second member.
- the support portions 34 are uniformly arranged on the inner side of the peripheral wall portion 33.
- the upper end surface 33A and the side surface 37 of the peripheral wall portion 33 of the substrate holder PH have liquid repellency.
- a liquid-repellent material such as a fluorine-based resin material or an acrylic resin material is applied, or a thin film made of the liquid-repellent material is attached.
- a lyophobic material for making lyophobic a material that is insoluble in liquid 1 is used.
- FIG. 4 is an enlarged sectional view of a main part of a substrate stage PST holding a substrate P.
- the ring-shaped plate portion 30 is placed in the recess 32 with its outer periphery fitted into the substrate table 52 and is formed to be thinner than the thickness of the substrate P, facing the side surface (peripheral portion) PB of the substrate P.
- it has an inner peripheral surface 3 and an inclined surface (inclined portion) 5 which is gradually inclined downward according to the outward force starting from the lower end portion (first portion) 4 of the inner peripheral surface 3.
- the upper end of the inclined surface 5 (that is, the lower end of the inner peripheral surface 3) 4 is disposed at a position higher than the upper end surface 33A of the peripheral wall portion 33 and the upper end surface 34A of the support portion 34.
- the flat surface 31 of the plate portion 30 has liquid repellency to the liquid 1, and the inner peripheral surface 3 and the inclined surface 4 of the plate portion 30 serve as the lyophilic portion. It is lyophilic to 1.
- the same treatment as that of the substrate holder PH described above can be employed.
- the lyophilic treatment for the inner peripheral surface 3 and the inclined surface 4 irradiation with ultraviolet light, plasma treatment using oxygen as a reactive gas, or treatment for exposure to an ozone atmosphere can be employed.
- the plate portion 30 is formed of a material having liquid repellency (such as a fluororesin), and the inner peripheral surface 3 and the inclined surface 4 are subjected to the above-mentioned lyophilic treatment, or a lyophilic metal (or metal film) is formed. It may be attached (or formed into a film).
- a material having liquid repellency such as a fluororesin
- a space formed between the plate portion 30 and the side surface PB of the substrate P is provided in the plate portion 30.
- a suction device 60 for sucking the liquid flowing into 39 is provided.
- the suction device 60 includes a tank 61 capable of storing the liquid 1, a flow path 62 provided inside the plate unit 30 and the substrate table 52 and connecting the space 39 and the tank 61, and a valve provided in the tank 61. And a pump 64 connected via a pump 63.
- the flow path 62 is open to the space 39 near the lower end of the inclined surface 5 (downward), and the inner wall surface is also subjected to the above-described liquid repellent treatment.
- the inner peripheral surface 3 and the inclined surface 5 of the plate portion 30 having lyophilicity and the suction device 60 constitute a recovery device according to the present invention.
- a photoresist (photosensitive material) 90 is applied to a surface PA which is an exposed surface of the substrate P.
- the photosensitive material 90 is a photosensitive material for ArF excimer laser (for example, TARF-P6100 manufactured by Tokyo Ohka Kogyo Co., Ltd.) and has liquid repellency (water repellency), and its contact angle is It is about 70-80 °.
- the side surface PB of the substrate P is subjected to a liquid-repellent treatment (water-repellent treatment).
- the photosensitive material 90 having liquid repellency is also applied to the side surface PB of the substrate P.
- the photosensitive material 90 is also applied to the back surface PC of the substrate P and subjected to a liquid repellent treatment.
- FIG. 4 is a cross-sectional view of the notch portion PV, and the outer periphery of the substrate other than the notch portion is indicated by a two-dot chain line.
- the gap between the inner peripheral surface 3 of the plate portion 30 other than the notch portion and the outer periphery of the substrate is, for example, 0.3-0.5 mm, and the inner peripheral surface 3 of the plate portion 30 of the notch portion PV and the outer peripheral surface of the substrate are different from each other.
- the gap is, for example, 1.5 to 2. Omm.
- the substrate stage PST is provided with a suction device 40 for reducing the pressure in the space 38 surrounded by the peripheral wall 33 of the substrate holder PH.
- the suction device 40 is formed inside a plurality of suction ports 41 provided on the upper surface of the base portion 35 of the substrate holder PH, a vacuum portion 42 including a vacuum pump provided outside the substrate stage PST, and the inside of the base portion 35. And a flow path 43 connecting each of the plurality of suction ports 41 to the vacuum section 42.
- the suction ports 41 are provided at a plurality of predetermined positions on the upper surface of the base portion 35 other than the support portion 34, respectively.
- the suction device 40 sucks gas (air) inside the space 38 formed between the peripheral wall portion 33, the base portion 35, and the substrate P supported by the support portion 34, and applies a negative pressure to the space 38. By applying pressure, the substrate P is sucked and held by the peripheral wall portion 33 and the support portion 34.
- the operations of the collecting device (suction device 60) and the suction device 40 are controlled by the control device CONT.
- the edge area E of the substrate P when the edge area E of the substrate P is subjected to the immersion exposure, the liquid in the immersion area AR2 is exposed. 1 Force The surface of the substrate P is arranged on a part of the PA and a part of the flat surface 31 of the plate part 30. At this time, if the edge area E to be exposed is located at a position other than the notch portion PV of the substrate P, the surface PA of the substrate P and the flat surface 31 of the plate portion 30 have been subjected to lyophobic treatment. Is not large, the liquid 1 in the immersion area AR2 hardly flows into the gap A due to its surface tension, which makes it difficult to enter the gap A.
- the gap between the outer periphery PB of the substrate P and the inner periphery 3 of the plate portion 30 is as large as, for example, about 2 mm. Therefore, the liquid 1 may enter the space 39 shown in FIG.
- the liquid 1 flowing into the space 39 is Due to its affinity with the inner peripheral surface 3 and its own weight, it moves (transmits) from the inner peripheral surface 3 along the inclined surface 5 and reaches the opening of the flow channel 62.
- the suction device 60 by operating the pump 64 at all times, the negative pressure increases when the flow path 62 is blocked by the liquid 1, so that the liquid 1 that has reached the opening of the flow path 62 is discharged.
- the liquid can be suctioned and collected in the tank 61 through the flow path 62.
- the tank 61 is provided with a discharge channel 61A, and when a predetermined amount of the liquid 1 is accumulated, the liquid 1 is discharged from the discharge channel 61A.
- the pressure in the concave portion 32 is kept constant when the liquid 1 does not block the flow path 62, and the vibration caused by suction is not transmitted to the substrate P.
- a gap is formed between the collecting members 23 and 24 of the liquid collecting mechanism 20, but since the flat surface 31 has liquid repellency, the liquid 1 flows through the gap. It can be prevented from flowing out, so that it does not hinder the exposure processing.
- the liquid 1 is prevented from flowing between the substrate P and the holder PH (peripheral wall portion 33).
- Projection optical system Immersion exposure can be performed while holding the liquid 1 well under the PL.
- the liquid 1 flowing into the space 39 is used by using the inner peripheral surface 3 and the inclined surface 5 as the lyophilic portion to reach the flow path 62 of the suction device 60 at a position separated from the substrate. Since it can be guided and easily collected, even when the substrate P on which the notch PV for alignment is formed is used, it is possible to prevent the liquid 1 from flowing around the notch PV and perform good immersion exposure.
- the upper end 4 of the inclined surface 5 is located at a position higher than the upper end surface 33A which is the substrate holding surface, the liquid 1 flowing into the space 39 is inclined before reaching the upper end surface 33A. 5 and the suction and recovery of the liquid 1 becomes more reliable.
- the side surface 37 and the upper end surface 33A of the peripheral wall portion 33 of the substrate holder PH are made lyophobic, even when the liquid 1 goes around the back surface of the substrate P, Intrusion into space 38 can be prevented.
- the flat surface 31 of the plate portion 30 is also subjected to the lyophobic treatment, the liquid 1 forming the liquid immersion region AR2 is prevented from being excessively spread to the outside of the plate portion 30 and the liquid immersion region AR2 is improved.
- the liquid 1 can be prevented from inconvenience such as outflow and scattering.
- FIG. 5 and FIG. 6 are views showing a second embodiment of the stage device of the present invention.
- the liquid 1 is transmitted to the inclined surface of the plate section 30 by its own weight and guided in a direction away from the substrate P.
- the second embodiment adopts a configuration in which the liquid is sucked using the capillary phenomenon. ing.
- FIGS. 5 and 6 the same elements as those of the first embodiment shown in FIG. 4 and the like are denoted by the same reference numerals, and description thereof will be omitted.
- the plate portion 30 in the present embodiment has a back surface 7 extending horizontally (substantially parallel to the substrate holding surface 33A) with the lower end 4 of the inner peripheral surface 3 as a base end. ing.
- a plurality of slits (recesses) 8 are formed with one end opened in a space 39 between the side surface PB of the substrate P and the inner peripheral surface 3.
- the slits 8 have a very small width and are formed in a plurality at predetermined intervals radially over the entire circumference of the inner peripheral surface 3. Then, at the tip of the slit 8, The opening of the flow path 62 of the pulling device 60 is arranged.
- the bottom surface 7 including the slit 8 is subjected to the lyophilic treatment described above and has a lyophilic property.
- FIG. 6 shows the state in which the number of slits 8 is reduced for easy understanding, in practice, many slits 8 are formed at a fine pitch so that the liquid can be efficiently sucked. I have.
- the liquid 1 that has flowed into the space 39 is sucked into the slit 8 by the affinity and the capillary phenomenon in the slit 8, and is sucked and collected from the end of the slit 8 via the flow channel 62. Therefore, it is possible to prevent the liquid 1 from flowing around to the back side of the substrate P, and to perform good immersion exposure.
- a configuration in which the slit of the present embodiment is applied to the inclined surface 5 of the first embodiment is also suitable.
- the suction force due to the capillary phenomenon is added with its own weight, the suction force can be increased and the liquid 1 can be more reliably suctioned and collected.
- FIG. 7 is a diagram showing a third embodiment of the stage device of the present invention.
- the liquid is suctioned and recovered using the suction pressure difference between the plate portion and the substrate and the lyophilic portion.
- the plate unit 30 is formed in a ring plate shape, and is placed and fixed on the substrate table 52.
- a groove 9 opening upward is formed over the entire circumference at a position covered by the plate portion 30.
- the flow path 62 of the suction device 60 is provided on the substrate table 52 and connects the groove 9 to the tank 61.
- a step 52A for forming a minute gap with the back surface 7 of the plate portion 30 is formed on the inner peripheral side of the groove 9 in the substrate table 52, and the groove 9 and the space 39 are formed through this gap. And are connected to each other.
- the control device CONT has a negative pressure suction force for sucking the inside of the groove 9 rather than a negative pressure suction force for sucking the space 38 for holding the substrate P in the substrate holder PH.
- a negative pressure suction force for sucking the space 38 for holding the substrate P in the substrate holder PH are controlled so that the pressure increases. Therefore, when the liquid 1 flows into the space 39, the negative pressure in the groove 9 (the plate portion 30 side) is larger than the negative pressure in the space 38 (the substrate holder PH side), so that the liquid 1 is applied to the back surface of the plate portion 30.
- the back surface PC of the substrate P and the upper end surface 33A of the substrate holder PH have liquid repellency
- the back surface 7 of the plate portion 30 and the substrate table Since the step 52A of the 52 has the lyophilic property, the liquid 1 can be easily sucked into the plate 30 side by the affinity for the liquid 1 and reliably collected.
- the force S in which the plate portion 30 has the inner peripheral surface 3 having the lyophilic property and the inclined surface 5 is not limited to the force S as shown in FIG.
- the inner peripheral surface 3 may be formed over the entire thickness of the plate portion 30 without forming the inclined surface.
- the inner peripheral surface 3 is subjected to a lyophilic treatment, and an opening of the flow path 62 in the suction device 60 is provided.
- the liquid 1 that has flowed into the space 39 travels along the inner peripheral surface 3 due to its affinity with the inner peripheral surface 3 and its own weight, and is suctioned and collected into the tank 61 via the flow path 62.
- the same effect as in the first embodiment can be obtained.
- the flat surface 31 of the plate portion 30 in the above embodiment faces at least the first and second recovery members 23 and 24 of the liquid recovery mechanism 20 without having to have liquid repellency on the entire surface. It is only necessary that the remaining positions have liquid repellency. Also in the substrate holder PH, the upper surface 33A of the peripheral wall portion 33 facing the rear surface PC of the substrate P and the side surface 37 facing the plate portion 30 (space 39) need not have liquid repellency. What is necessary is just to have the property.
- the back surface 7 does not necessarily have to have the lyophilic property.
- the liquid-repellent treatment may be performed only on the region of the rear surface PC of P facing the peripheral wall portion 33.
- a photosensitive material 90 having liquid repellency is applied for the liquid repellent treatment of the side surface PB and the back surface PC of the substrate P.
- the liquid repellency (water repellency) other than the photosensitive material 90 is applied to the side surface PB and the back surface PC.
- a predetermined material having the following may be applied.
- a protective layer called a top coat layer (a film that also protects the photosensitive material 90 with a liquid force) may be applied on the photosensitive material 90 coated on the surface PA, which is the exposed surface of the substrate P.
- the material for forming the coat layer for example, a fluorine-based resin material
- a material having liquid repellency other than the photosensitive material 90 and the material for forming the top coat layer may be applied.
- the above-described photosensitive material and the material for forming the top coat layer are applied to the substrate stage PST and The material may be applied to the substrate holder PH, or conversely, a material used for the liquid repellent treatment of the substrate stage PST and the substrate holder PH may be applied to the side surface PB and the back surface PC of the substrate P.
- the top coat layer is often provided to prevent the liquid 1 in the liquid immersion area AR2 from penetrating into the photosensitive material 90.
- a trace of adhesion of the liquid 1 on the top coat layer (a so-called ⁇ Even if ()) is formed, by removing this top coat layer after the liquid immersion exposure, a predetermined process such as a development process can be performed after removing the watermark together with the top coat layer.
- a predetermined process such as a development process can be performed after removing the watermark together with the top coat layer.
- the top coat layer is formed of, for example, a fluorine-based resin material, it can be removed using a fluorine-based solvent. This eliminates the need for a device for removing the water mark (e.g., a substrate cleaning device for removing the watermark), and has a simple configuration such as removing the top coat layer with a solvent.
- Predetermined process processing can be performed favorably.
- the notch having a V-shape in plan view is provided as the notch for positioning the substrate P, but the substrate is notched in a direction orthogonal to the radial direction.
- the present invention can be applied to a substrate provided with a so-called orientation flat (orientation 'flat), and further to a substrate having no notch for alignment.
- the liquid 1 is composed of pure water. Pure water has the advantage that it can be easily obtained in large quantities at a semiconductor manufacturing plant or the like, and that there is no adverse effect on the photoresist on the substrate P, optical elements (lenses), and the like. In addition, pure water has no adverse effect on the environment and has an extremely low impurity content. Therefore, it is expected that the surface of the substrate P and the surface of the optical element provided on the front end surface of the projection optical system PL are also cleaned. it can.
- PFPE perfluorinated polyether
- the refractive index n of pure water (water) with respect to the exposure light EL having a wavelength of about 193 nm is approximately 1.44
- ArF excimer laser light (wavelength 193 nm) was used as the light source of the exposure light EL.
- the wavelength is shortened to lZn, that is, about 134 nm on the substrate P, and high resolution is obtained.
- the depth of focus is expanded to about n times, that is, about 1.44 times as compared to that in the air, if it is sufficient to secure the same depth of focus as when using it in the air, the projection optics
- the numerical aperture of the system PL can be further increased, and the resolution is improved in this respect as well.
- the optical element 2 is attached to the tip of the projection optical system PL, and this lens is used to adjust the optical characteristics of the projection optical system PL, for example, aberrations (spherical aberration, coma, etc.). be able to.
- the optical element attached to the tip of the projection optical system PL may be an optical plate used for adjusting the optical characteristics of the projection optical system PL. Alternatively, it may be a plane-parallel plate that can transmit EL light.
- the space between the projection optical system PL and the surface of the substrate P is filled with the liquid 1, but, for example, a cover glass made of a plane-parallel plate is attached to the surface of the substrate P.
- the liquid 1 may be filled in the state.
- the liquid 1 of the present embodiment is water, but may be a liquid other than water.
- the light source of the exposure light EL is an F laser
- this F laser light does not pass through water, so the liquid 1
- Is a fluorine-based fluid such as a fluorine-based oil that can transmit F laser light.
- liquid 1 there is another transmittance for the exposure light EL. It is also possible to use a projection optical system with a high refractive index or a material that is stable with respect to the photoresist applied to the surface of the substrate P (for example, cedar oil). Also in this case, the surface treatment is performed according to the polarity of the liquid 1 to be used.
- the substrate P in each of the above embodiments is not limited to a semiconductor wafer for manufacturing a semiconductor device, but may be a glass substrate for a display device, a ceramic wafer for a thin-film magnetic head, or a mask or a mask used in an exposure apparatus.
- a reticle master synthetic quartz, silicon wafer, etc. is applied.
- the exposure apparatus EX includes a step of scanning and exposing the pattern of the mask M by synchronously moving the mask M and the substrate P.
- the pattern of the mask M is exposed collectively while the mask M and the substrate P are stationary, and the method can be applied to a step-and-repeat type projection exposure apparatus (stepper) that sequentially moves the substrate P step by step.
- the present invention can be applied to a step-and-stitch type exposure apparatus that transfers at least two patterns on the substrate P while partially overlapping each other.
- the present invention can also be applied to a twin-stage type exposure apparatus disclosed in JP-A-10-163099, JP-A-10-214783, and JP-T-2000-505958.
- the type of the exposure apparatus EX is not limited to an exposure apparatus for manufacturing a semiconductor element for exposing a semiconductor element pattern onto a substrate P, but may be an exposure apparatus for manufacturing a liquid crystal display element or a display, a thin-film magnetic head, It can be widely applied to an exposure device for manufacturing an image pickup device (CCD), a reticle or a mask, and the like.
- CCD image pickup device
- each stage PST and MST can be either a type that moves along the guide or a guideless type that does not have a guide.
- each stage PST and MST is such that a magnet unit having a two-dimensionally arranged magnet and an armature unit having a two-dimensionally arranged coil are opposed to each other, and each stage is driven by electromagnetic force.
- a planar motor for driving PST and MST may be used.
- one of the magnet unit and the armature unit may be connected to the stages PST and MST, and the other of the magnet unit and the armature unit may be provided on the moving surface side of the stages PST and MST.
- JP-A-8-330224 (USP No. 5,874,820)
- a reaction force generated by the movement of the mask stage MST is prevented from being transmitted to the projection optical system PL by using a frame member. You may mechanically escape to the floor (ground).
- anti-power may be processed using the law of conservation of momentum.
- the exposure apparatus EX of the embodiment of the present application assembles various subsystems including the respective components described in the claims of the present application so as to maintain predetermined mechanical accuracy, electrical accuracy, and optical accuracy. It is manufactured by. Before and after this assembly, adjustments to achieve optical accuracy for various optical systems, adjustments to achieve mechanical accuracy for various mechanical systems, Adjustments are made to achieve electrical accuracy for various electrical systems.
- the process of assembling the various subsystems into the exposure apparatus includes mechanical connections, wiring connections of electric circuits, and piping connections of pneumatic circuits among the various subsystems. It goes without saying that there is an assembling step for each subsystem before the assembling step from these various subsystems to the exposure apparatus. When the process of assembling the various subsystems into the exposure apparatus is completed, comprehensive adjustment is performed, and various precisions of the entire exposure apparatus are ensured. It is desirable to manufacture the exposure apparatus in a clean room where the temperature and cleanliness are controlled.
- a micro device such as a semiconductor device includes a step 201 for designing a function and a performance of the micro device, a step 202 for manufacturing a mask (reticle) based on this design step, and Step 203 of manufacturing a substrate as a base material, exposure processing step 204 of exposing a mask pattern to the substrate by the exposure apparatus EX of the above-described embodiment, and device assembly steps (dicing step, bonding step, package step). 205), inspection step 206, etc.
- the liquid can be prevented from flowing around between the substrate and the holder, and the immersion exposure can be performed while the liquid is well held under the projection optical system.
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Abstract
Description
Claims
Priority Applications (16)
Application Number | Priority Date | Filing Date | Title |
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DE602004030481T DE602004030481D1 (de) | 2003-12-15 | 2004-12-15 | Bühnensystem, belichtungsvorrichtung und belichtungsverfahren |
KR1020157002703A KR101681852B1 (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
KR1020067008543A KR101119813B1 (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
KR1020137017237A KR101547037B1 (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
EP04807061A EP1699073B1 (en) | 2003-12-15 | 2004-12-15 | Stage system, exposure apparatus and exposure method |
KR1020147005370A KR101499405B1 (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
US10/582,268 US7982857B2 (en) | 2003-12-15 | 2004-12-15 | Stage apparatus, exposure apparatus, and exposure method with recovery device having lyophilic portion |
KR1020167032982A KR101941351B1 (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
KR1020197001229A KR20190007529A (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
KR1020127020219A KR101281397B1 (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
JP2005516240A JP4720506B2 (ja) | 2003-12-15 | 2004-12-15 | ステージ装置、露光装置、及び露光方法 |
AT04807061T ATE491221T1 (de) | 2003-12-15 | 2004-12-15 | Bühnensystem, belichtungsvorrichtung und belichtungsverfahren |
KR1020117026180A KR101345443B1 (ko) | 2003-12-15 | 2004-12-15 | 스테이지 장치, 노광 장치, 및 노광 방법 |
HK06112663.5A HK1092280A1 (en) | 2003-12-15 | 2006-11-17 | Stage system, exposure apparatus and exposure method |
US12/926,763 US9798245B2 (en) | 2003-12-15 | 2010-12-08 | Exposure apparatus, and exposure method, with recovery device to recover liquid leaked from between substrate and member |
US15/703,427 US20180004096A1 (en) | 2003-12-15 | 2017-09-13 | Stage apparatus, exposure apparatus, and exposure method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003416712 | 2003-12-15 | ||
JP2003-416712 | 2003-12-15 |
Related Child Applications (2)
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US10/582,268 A-371-Of-International US7982857B2 (en) | 2003-12-15 | 2004-12-15 | Stage apparatus, exposure apparatus, and exposure method with recovery device having lyophilic portion |
US12/926,763 Continuation US9798245B2 (en) | 2003-12-15 | 2010-12-08 | Exposure apparatus, and exposure method, with recovery device to recover liquid leaked from between substrate and member |
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WO2005057636A1 true WO2005057636A1 (ja) | 2005-06-23 |
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PCT/JP2004/018702 WO2005057636A1 (ja) | 2003-12-15 | 2004-12-15 | ステージ装置、露光装置、及び露光方法 |
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US (3) | US7982857B2 (ja) |
EP (1) | EP1699073B1 (ja) |
JP (8) | JP4720506B2 (ja) |
KR (8) | KR101119813B1 (ja) |
CN (1) | CN100487860C (ja) |
AT (1) | ATE491221T1 (ja) |
DE (1) | DE602004030481D1 (ja) |
HK (1) | HK1092280A1 (ja) |
WO (1) | WO2005057636A1 (ja) |
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